Overhead valve type internal combustion engine

Details Overhead valve type internal combustion engine Overhead valve type internal combustion engine

F - Mech Eng,Light,Heat,Weapons

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F01M 9/10 (2006.01) F01L 1/053 (2006.01) F01M 11/02 (2006.01) F01M 11/06 (2006.01) F01P 3/02 (2006.01) F02F 1/20 (2006.01) F02F 1/38 (2006.01) F02F 1/42 (2006.01)

Patent

CA 2614054

In an overhead valve type internal combustion engine including a valve gear lubricated in a valve gear chamber, to contrive simultaneous realization of both reductions in size of the valve gear chamber and a cylinder head and enhancement of performance of discharge of a lubricating oil from the valve gear chamber. In an internal combustion engine in which a valve gear is lubricated with a lubricating oil in a valve gear chamber defined by a cylinder head and a cylinder head cover, the cylinder head is provided with insertion holes in which head bolts are inserted and which are not opened into the valve gear chamber, and with an oil discharge passage which has an inlet opened into the valve gear chamber and an outlet opened into the insertion hole. The inlet of the oil discharge passage is disposed at an end part on one side in the vehicle width direction of the valve gear chamber, and an opening part of a chain chamber in which a chain for transmitting the power of a crankshaft is transmitted to a cam shaft is disposed is laid out at an end part on the other side in the vehicle width direction of the valve gear chamber.

L'invention concerne un moteur à combustion interne à soupapes en tête pourvu d'un système amélioré de lubrification des soupapes. Les soupapes sont lubrifiées par de l'huile lubrifiante pulvérisée dans le compartiment des soupapes, qui se trouve entre la culasse et le couvre-culasse. La culasse est percée d'orifices dans lesquels on insère des boulons à tête, à l'extérieur du compartiment des soupapes. Un passage pour l'évacuation de l'huile est également aménagé. L'orifice d'admission de l'huile lubrifiante dans ce passage est situé dans le compartiment des soupapes et son orifice de sortie s'ouvre sur l'orifice d'insertion. De préférence, l'orifice d'entrée du passage d'évaluation de l'huile est situé à une extrémité (dans le sens de la largeur du véhicule) du compartiment des soupapes. L'ouverture du compartiment dans lequel se trouve la chaîne transmettant le mouvement du vilebrequin à l'arbre à cames se trouve également à l'extrémité opposée du compartiment des soupapes.

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